1. installed water power generating system, there's no need to use battery or connecting power source, once connecting water, led will shine. 2. color changes while the temperature changes: a. led is bule while the water temperature is under 30℃ b. led changes to red-blue when the water tempe...

7 colour instructions: 1. installed water power generating system, there's no need to use battery or connecting power source, once connecting water, led will shine. 2. the color will change in per 3-5 seconds to form the effect of 7 colors changing. material: abs led light: 12pcs